Study On Statistical Damage Simulation Of Full Deformation Process For Geo-material

It is one of the hot spots in geotechnical engineering to study statistical damage constitutive model which can simulate the full deformation process of the geo-material for a long time. In recent years, by adopting statistical damage theory, along with its related research has made great progress. Previous scholars established a series of modles which can reflect full deformation process of the geo-material, they were based on strain-equivalence hypothesis by J.Lemaitre, and were adopting the concepts of micro-element strength and obeying the random distribution. But these modles failed to indicate geo-material’s deformation properties after failure of geo-material, and they accounted that after failure geo-material can not carry or geo-material’s carrying capacity would disappear with the increase of strain. This is clearly not consistent with the actual situation. How to establish a new modles which can reflect full deformation process of the geo-material, it has important theoretical and practical engineering significance, it is also the focus of this study.On the basis of the results of previous studies, this paper mainly researched on statistical damage constitutive model which can simulate the full deformation process of the geo-material. Fisstly, based on discussing the deformation characteristics at every stage in full deformation process of strain softening rock. Aiming at some deficiencies of strain-equivalence hypothesis by J.Lemaitre and according to more reasonable hypothesis, a new damage model for rock is proposed which can reflect the characteristics of residual strength after failure and volume change. Then by adopting statistical damage theory and considering the influences of damage threshold on rock’s transformation, a new statistical damage constitutive model which can simulating the full deformation process of strain softening rock was established, This model can reflect the influence of volume change and initial voids ratio on rock’s transformation. Secondly, combined with saturated soil’s principle of effective stress, a new damage model for saturated soil is proposed which can reflect the characteristics of residual strength after failure. Then conducted saturated soil’s undrained tests and consolidated undrained test, validated with the model, and achieved good results.The results of this study is not have only fewer parameters, but also have clear physical meaning, compared with the same type of model it can better reflect the geotechnical deformation process, and it is more reasonable and convenient for engineering application.